/*
 * bench_syscall.c — raw syscall round-trip cost.
 *
 * This is the number that justifies the whole project: for a kernel-first
 * libc (project guideline #6), every wrapper is one `syscall` instruction
 * away from the kernel. getpid() is the cheapest syscall there is, so
 * this measures the floor. 1M iterations; results in ns per call.
 */

#include <unistd.h>

#include "bench.h"

#define ITERS 1000000UL

int main(void)
{
    volatile pid_t sink = 0;
    long long t0, t1;

    t0 = bench_now_ns();
    for (unsigned long i = 0; i < ITERS; i++)
        sink += getpid();
    t1 = bench_now_ns();

    (void)sink;
    bench_print_u64((unsigned long long)((t1 - t0) / ITERS));
    return 0;
}